string = "他问,你知道cba是什么单词的缩写么?"
print(string)
print('1.删除空格')
print('2.英文标点替换')
print('3.首字母大写')
print('4.退出')
while True:
    option = input("请输入功能选项: \n")
    if option=='1' :
        string = string.replace('' ,'')
        print(string)
    elif option =='2':
        #替换英文标点
        for i in string:
            if i==',':
                string = string.replace(',', '，')
            elif i =='.':
                string = string.replace('.', '。' )
            elif i == '?':
                string = string.replace('?', '? ')
            elif i=='?':
                string = string.replace("'", "")
        string = string
        print(string)
    elif option =='3':
        #首字母大写
        string = string.upper()
        print(string)
    elif option == '4':
        break